When it comes to product placement, a controversial but original idea would have to be stained glass windows.

Notcot speculates that the design of the stained glass windows in the Notre Dame in Reims features the distinctive Veuve Clicquot. Interesting placement to catch the wandering eyes of churchgoers.

I think this is even better, though…

This is a stained glass window in St Martin’s church, Bratislava. Clearly visible in the two middle windows are the name and insignia of a key benefactor. (Sipox is, I believe, a bank. Perhaps it’s as secure as a church? Hmm…)